508155-01 Issue 2108 Page 27 of 49
Placement and Installation
Make sure unit is installed in accordance with installation
instructions and applicable codes.
Start-Up
Preliminary and Seasonal Checks
1. Inspect electrical wiring, both eld and factory installed
for loose connections. Tighten as required.
2. Check voltage at disconnect switch. Voltage must be
within range listed on the nameplate. If not, consult the
power company and have voltage condition corrected
before starting unit.
Heating Start-Up
Shock and burn hazard.
A80US2V units are equipped with a hot surface ignition
system. Do not attempt to light manually.
WARNING
Gas Valve Operation
Figure 17.
1. STOP! Read the safety information at the beginning
of this section.
2. Set the thermostat to the lowest setting.
3. Turn o all electrical power to the unit.
4. This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
5. Remove the upper access panel.
6. Move gas valve switch to OFF. See Figure 17.
7. Wait ve minutes to clear out any gas. If you then
smell gas, STOP! Immediately call your gas supplier
from a neighbor’s phone. Follow the gas supplier’s
instructions. If you do not smell gas go to next step.
8. Move gas valve switch to ON. See Figure 17.
9. Replace the upper access panel.
10. Turn on all electrical power to to the unit.
11. Set the thermostat to desired setting.
NOTE: When unit is initially started, steps 1 through
11 may need to be repeated to purge air from gas line.
12. If the appliance will not operate, follow the instructions
“Turning O Gas to Unit” and call your service
technician or gas supplier.
Turning O Gas to Unit
1. Set the thermostat to the lowest setting.
2. Turn o all electrical power to the unit if service is to
be performed.
3. Remove the upper access panel.
4. Move gas valve switch to OFF.
5. Replace the upper access panel.
Failure to Operate
If the unit fails to operate, check the following:
1. Is the thermostat calling for heat?
2. Are access panels securely in place?
3. Is the main disconnect switch closed?
4. Is there a blown fuse or tripped circuit breaker?
5. Is the lter dirty or plugged? Dirty or plugged lters will
cause the limit control to shut the unit o.
6. Is gas turned on at the meter?
7. Is the manual main shut-o valve open?
8. Is the internal manual shut-o valve open?
9. Is the unit ignition system in lock out? If the unit locks
out again, call the service technician to inspect the unit
for blockages.
10. Is pressure switch closed? Obstructed ue will cause
unit to shut o at pressure switch. Check ue and
outlet for blockages.
11. Are ame rollout switches tripped? If ame rollout
switches are tripped, call the service technician for
inspection.
Safety or Emergency Shutdown
Turn o unit power. Close manual and main gas valves.
Extended Period Shutdown
Turn o thermostat or set to “UNOCCUPIED” mode.
Close all gas valves (both internal and external to unit)
to guarantee no gas leak into combustion chamber. Turn
o power to unit. All access panels and covers must be in
place and secured.
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